textproduct: Quad Cities

KEY MESSAGES

- Post frontal regime and eventual incoming high pressure will provide fair and more seasonable weather through Friday.

- An active period will continue from the weekend through the beginning of the work week. Next chances for showers and storms are Saturday, followed by a second system late Sunday through Tuesday.

SHORT TERM /THROUGH FRIDAY/

Issued at 304 AM CDT Thu Sep 10 2026

This morning, high clouds from storms across northern Missouri are in place across much of southeast Iowa and west-central Illinois. While cloud cover typically helps limit the radiational cooling that leads to fog development, a moist surface layer and weak winds this morning have already contributed to isolated areas of patchy fog, primarily along the river valleys. As these high clouds move eastward, additional fog development is expected area-wide. The potential for dense fog remains low (10-30%), with the greatest chances along and south of Highway 34 where dewpoint depressions are smallest.

Fog will burn off in the hours after daybreak, leading to a pleasant and dry day with highs in the upper 70s to low 80s. Cloud cover will clear gradually through the day, allowing for temps overnight to drop once again into the upper 50s to low 60s. As high pressure remains in place over the area, Friday will be a near repeat of today, with highs only a degree or two higher as ridging builds into our west.

LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/

Issued at 304 AM CDT Thu Sep 10 2026

From Friday night onward, an active period is in store as near-zonal to northwesterly flow returns. This will bring chances for showers and storms near-daily for parts of the area.

Friday Night and Saturday... Following a brief bout of ridging, an upper level shortwave will bring the next chances for showers and storms late Friday night into Saturday. While the bulk of forcing will remain to the north, a frontal boundary will provide enough forcing for showers and isolated storms as it plows into a pool of modest instability.

Also on Saturday, a strong shortwave will move into the Pacific Northwest, which will shape the forecast Sunday through Wednesday. While models present a number of solutions with regard to timing and track, all agree that this system will be our next chance for substantial rainfall. As this trough strengthens over the Intermountain West, ridging over the north-central CONUS will bring us the potential for yet another day of above-normal temperatures on Monday. This will also help support growing instability ahead of the system. This, along with vertical shear profiles, will support the potential for severe thunderstorms. In fact, SPC has issued a Slight, level 2 of 5, risk of severe thunderstorms for the far western edge of the CWA for Monday.

Behind this system, a cooler but still active period with near-daily chances for rainfall is expected.

AVIATION /12Z TAFS THROUGH 12Z FRIDAY/

Issued at 643 AM CDT Thu Sep 10 2026

Largely VFR conditions were observed across the area early this morning, with some pockets of MVFR to IFR ceilings and visibilities mainly in low-lying areas. Higher clouds blown off of storms over northern Missouri has helped conditions to improve overall, and conditions should gradually improve as the morning goes on. The higher clouds will also diminish from the north as an area of high pressure and dry air builds in. Light and variable winds are expected today.

With clear skies overnight, along with generally light southeasterly winds, we will need to keep an eye on the potential for more fog tonight.

DVN WATCHES/WARNINGS/ADVISORIES

IA...None. IL...Dense Fog Advisory until 8 AM CDT this morning for ILZ007-009- 017-018. MO...None.